Spectroscopie résolue en phase de pulsars gamma millisecondes

Abstract : The Fermi gamma-ray telescope, launched in August 2008, has opened a new window in the pulsar physics. Hardly half of the pulsed source detections corresponds to old re-accelerated neutron stars, the millisecond pulsars. The spectral analysis of the pulsed emission is crucial to constrain the theorical models describing the particle acceleration processes in the pulsar magnetosphere. This thesis focus on the systematical spectral study of 25 millisecond gamma-ray pulsars in the energy band : 50 MeV — 170 GeV. With 60 months of observations, we obtained and characterized the spectra of the total emission and the emission in characteristic rotational phase intervals. We looked at the global trends that could exist between the neutron star characteristics such as the spin-down power and the emission spectral properties. We studied as well the evolution of the latter across the rotational phase and their dependence with the morphological parameters of the light curves provided by a decomposition in morphological components of the gamma-ray profiles. These analyses shown unprecedented spectral and energetic trends. We compared the obtained results with the theoretical predictions and the previous observations. We discussed their implications on the radiation origin in regions where the magnetic field parallel electric field component is more or less efficiently screened and on the emission processes taking place.
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https://hal-univ-diderot.archives-ouvertes.fr/tel-01664876
Contributor : Nicolas Renault-Tinacci <>
Submitted on : Friday, December 15, 2017 - 11:53:11 AM
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Nicolas Renault-Tinacci. Spectroscopie résolue en phase de pulsars gamma millisecondes. Phénomènes cosmiques de haute energie [astro-ph.HE]. Université Paris 7 - Denis Diderot, 2014. Français. ⟨tel-01664876⟩

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